• promzy prince momentum
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    i need a summary of the topic momentum at it's easiest form, including its formulas.
    28 September 2010Comment
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    • ogugua belonwu Any moving body is said to possess momentum.
      An object which is at rest has no momentum.

      There is a ball and stone on the ground. Since they are at rest they don't have momentum. To make it have momentum one must make it move.

      Naturally we kick them to gain momentum {motion}.

      Momentum is why the driver of a car applies the brake to stop the car rather than just taking his foot off the accelerator. The car has gathered momentum and will continue to move forward after the driver stops accelerating it.

      A boy riding a bicycle is coming toward us, of course with some small speed. If you do want, you will dare to stop him by pushing against the hand bar of the bicycle.

      Since the boy was in motion he had momentum. Having stopped him, he has lost his momentum.

      A heavily loaded lorry is coming down the slope just starting from rest. You will not dare to stop it by pushing against it, even though it is coming slowly.

      A mosquito or a fly is flying toward you. With the palm, you will push aside it.

      If a bullet is coming toward you, you will not stop it but will avoid it hitting you.

      By analyzing such things in motion, we come to a conclusion that the quantity of motion depends not only on the speed of the object but also on the mass of the object.

      To stop an object in motion we have to impart equal and opposite momentum to that object and that depends on the product of the mass and speed of that object.

      Momentum = mass * velocity (velocity is speed of an object in a particular direction)

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    • andy chuks Momentum of a body is the product of its mass and its velocity.
      Mathematically Momentum = Mass x Velocity = MV
      Eg if a body of mass 10kg is moving at a velocity of 2m/s. The momentum is MV = 10 x 2 = 20kgm/s

      The change in Momentum of a body is called IMPULSE.
      Ft = MV - MU, where V is final velocity; U initial velocity; M mass of the body.

      The rate of change of momentum of a body is directly proportional to the applied force and acts in the direction of the force.
      F @ (MV - MV)/t
      F @ M(V - U)/t; (V - U)/t = a (acceleration)
      F @ ma
      F = kma
      1kg mass and 1m/s^2 acceleration will produce Force of 1N. Therefore K = 1
      F = ma

      Law of conservation of momentum states that in a closed system the total momentum of two or more bodies before collision is equal to the total momentum after collision.

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